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updatepri:

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- don't compare a scaled value with a unscaled value.
- actually, 7 times the loadfactor is necessary to decay p_estcpu enough,
  even before the recent p_estcpu changes.
  after the recent p_estcpu change, 8 times loadavg decay is needed.
- fix a comment to match with the recent reality.
This commit is contained in:
yamt 2005-12-15 13:43:49 +00:00
parent 6db9fd4698
commit d369d69d2f
1 changed files with 8 additions and 6 deletions
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14
sys/kern/kern_synch.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_synch.c,v 1.154 2005/12/11 12:24:29 christos Exp $ */
/* $NetBSD: kern_synch.c,v 1.155 2005/12/15 13:43:49 yamt Exp $ */
/*-
* Copyright (c) 1999, 2000, 2004 The NetBSD Foundation, Inc.
@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_synch.c,v 1.154 2005/12/11 12:24:29 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_synch.c,v 1.155 2005/12/15 13:43:49 yamt Exp $");
#include "opt_ddb.h"
#include "opt_ktrace.h"
@ -359,9 +359,11 @@ schedcpu(void *arg)
/*
* Recalculate the priority of a process after it has slept for a while.
* For all load averages >= 1 and max p_estcpu of 255, sleeping for at
* least six times the loadfactor will decay p_estcpu to less than
* (1 << ESTCPU_SHIFT).
* For all load averages >= 1 and max p_estcpu of (255 << ESTCPU_SHIFT),
* sleeping for at least eight times the loadfactor will decay p_estcpu to
* less than (1 << ESTCPU_SHIFT).
*
* note that our ESTCPU_MAX is actually much smaller than (255 << ESTCPU_SHIFT).
*/
void
updatepri(struct lwp *l)
@ -375,7 +377,7 @@ updatepri(struct lwp *l)
newcpu = p->p_estcpu;
loadfac = loadfactor(averunnable.ldavg[0]);
if (l->l_slptime > 5 * loadfac)
if ((l->l_slptime << FSHIFT) >= 8 * loadfac)
p->p_estcpu = 0; /* XXX NJWLWP */
else {
l->l_slptime--; /* the first time was done in schedcpu */